The SN75LVPE5421 can be used as a four channel protocol agnostic linear redriver multiplexer (mux) for data rates up to 32Gbps. To use the device in a non-PCIe application, the RX_DET pin must be pin-strapped to GND with 1kΩ resistor (L0).

This section explains how the SN75LVPE5421 can be used in DisplayPort (DP) application. The device is a linear redriver which is agnostic to DP link training. The DP link training negotiation between a display source and sink stays effective through the device. The redriver becomes part of the electrical channel along with passive traces, cables, and so forth, resulting in optimum source and sink parameters for best electrical link.

Figure 7-2 shows a simplified schematic for DisplayPort multiplexing application using SN75LVPE5421. Auxiliary and Hot plug detect (HPD) are muxed outside of the device. If system use case requires implementing DP power states, then the device must be controlled by the I²C.

Figure 7-2 Simplified Schematic for DisplayPort Multiplexer Application

The inverted DisplayPort HPD signal can be used to put the device into standby mode by using its PD pin. Note: in a DisplayPort link a sink can use HPD line to create an interrupt for its link partner source. If HPD signal is used for power management, then an RC filter must be installed to filter out HPD interrupt signals.

The SN75LVPE5421 can similarly be used for other AC-coupled high speed interfaces. Care must be taken to understand the specifications of the interface to ensure feasibility.